Mammalian biodiversity on Madagascar controlled by ocean currents

Abstract

Madagascar hosts one of the world’s most unusual, endemic, diverse and threatened concentrations of fauna1. To explain its unique, imbalanced biological diversity, G. G. Simpson proposed the ‘sweepstakes hypothesis’, according to which the ancestors of Madagascar’s present-day mammal stock rafted there from Africa2. This is an important hypothesis in biogeography and evolutionary theory for how animals colonize new frontiers1,3,4,5, but its validity is questioned5,6,7,8,9. Studies suggest that currents were inconsistent with rafting to Madagascar9 and that land bridges provided the migrants’ passage5,6,7,8. Here we show that currents could have transported the animals to the island and highlight evidence inconsistent with the land-bridge hypothesis. Using palaeogeographic reconstructions and palaeo-oceanographic modelling, we find that strong surface currents flowed from northeast Mozambique and Tanzania eastward towards Madagascar during the Palaeogene period, exactly as required by the ‘sweepstakes process’. Subsequently, Madagascar advanced north towards the equatorial gyre and the regional current system evolved into its modern configuration with flows westward10 from Madagascar to Africa. This may explain why no fully non-aquatic land mammals have colonized Madagascar since the arrival of the rodents and carnivorans during the early-Miocene epoch. One implication is that rafting may be the dominant means of overseas dispersal in the Cenozoic era when palaeocurrent directions are properly considered.

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Figure 1: Key geographical features/phenomena of the southwest Indian Ocean region.
Figure 2: Eocene ocean currents.

References

  1. 1

    Yoder, A. D. & Nowak, M. D. Has vicariance or dispersal been the predominant biogeographic in Madagascar? Only time will tell. Annu. Rev. Ecol. Evol. Syst. 37, 405–431 (2006)

    Article  Google Scholar 

  2. 2

    Simpson, G. G. Mammals and land bridges. J. Wash. Acad. Sci. 30, 137–163 (1940)

    Google Scholar 

  3. 3

    Heaney, L. R. Is a new paradigm emerging for oceanic island biogeography? J. Biogeogr. 34, 753–757 (2007)

    Article  Google Scholar 

  4. 4

    Thiel, M. & Haye, P. A. The ecology of rafting in the marine environment. III. Biogeographical and evolutionary consequences. Oceanogr. Mar. Biol. 44, 323–429 (2006)

    Article  Google Scholar 

  5. 5

    Tattersall, I. in Elwyn Simons: A Search for Origins (eds Fleagle, J. G. & Gilbert, C. C.) 397–408 (Springer, 2008)

    Google Scholar 

  6. 6

    Tattersall, I. Historical biogeography of the strepsirhine primates of Madagascar. Folia Primatol. (Basel) 77, 477–487 (2006)

    Article  Google Scholar 

  7. 7

    Masters, J. C., de Wit, M. J. & Asher, R. J. Reconciling the origins of Africa, India and Madagascar with vertebrate dispersal scenarios. Folia Primatol. (Basel) 77, 399–418 (2006)

    CAS  Article  Google Scholar 

  8. 8

    McCall, R. A. Implications of recent geological investigations of the Mozambique Channel for the mammalian colonization of Madagascar. Proc. R. Soc. Lond. B 264, 663–665 (1997)

    ADS  CAS  Article  Google Scholar 

  9. 9

    Stankiewicz, J., Thiart, C., Masters, J. C. & de Wit, M. J. Did lemurs have sweepstake tickets? An exploration of Simpson’s model for the colonization of Madagascar by mammals. J. Biogeogr. 33, 221–235 (2006)

    Article  Google Scholar 

  10. 10

    von der Heydt, A. & Dijkstra, H. A. Effect of ocean gateways on the global ocean circulation in the late Oligocene and the early Miocene. Paleoceanography 21, PA1011 (2006)

    ADS  Article  Google Scholar 

  11. 11

    Goodman, S. M., Ganzhorn, J. U. & Rakotondravony, D. in The Natural History of Madagascar (eds Goodman, S. M. & Benstead, J. P.) 1159–1186 (Chicago Univ. Press, 2003)

    Google Scholar 

  12. 12

    Yoder, A. D. et al. Single origin of Malagasy Carnivora from an African ancestor. Nature 421, 734–737 (2003)

    ADS  CAS  Article  Google Scholar 

  13. 13

    Poux, C. et al. Asynchronous colonization of Madagascar by the four endemic clades of primates, tenrecs, carnivores, and rodents as inferred from nuclear genes. Syst. Biol. 54, 719–730 (2005)

    Article  Google Scholar 

  14. 14

    Vences, M. Origin of Madagascar’s extant fauna: a perspective from amphibians, reptiles and other non-flying vertebrates. Ital. J. Zool. (Modena) 71 (suppl.). 217–228 (2004)

    Article  Google Scholar 

  15. 15

    Nagy, Z. T., Joger, U., Wink, M., Glaw, F. & Vences, M. Multiple colonization of Madagascar and Socotra by colubrid snakes: evidence from nuclear and mitochondrial gene phylogenies. Proc. R. Soc. Lond. B 270, 2613–2621 (2003)

    Article  Google Scholar 

  16. 16

    Krause, D. W. Fossil molar from a Madagascan marsupial. Nature 412, 497–498 (2001)

    ADS  CAS  Article  Google Scholar 

  17. 17

    Krause, D. W. et al. Late Cretaceous terrestrial vertebrates from Madagascar: implications for Latin American biogeography. Ann. Mo. Bot. Gard. 93, 178–208 (2006)

    Article  Google Scholar 

  18. 18

    Stuenes, S. Taxonomy, habits, and relationships of the subfossil Madagascan hippopotami Hippopotamus lemerlei and H. madagascariensis . J. Vertebr. Paleontol. 9, 241–268 (1989)

    Article  Google Scholar 

  19. 19

    Rabinowitz, P. D., Coffin, M. F. & Falvey, D. The separation of Madagascar and Africa. Science 220, 67–69 (1983)

    ADS  CAS  Article  Google Scholar 

  20. 20

    Ali, J. R. & Aitchison, J. C. Gondwana to Asia: plate tectonics, paleogeography and the biological connectivity of the Indian sub-continent from the Middle Jurassic through latest Eocene (166–35 Ma). Earth Sci. Rev. 88, 145–166 (2008)

    ADS  Article  Google Scholar 

  21. 21

    Godinot, M. Lemuriform origins as viewed from the fossil record. Folia Primatol. (Basel) 77, 446–464 (2006)

    Article  Google Scholar 

  22. 22

    Rabinowitz, P. D. & Woods, S. The Africa–Madagascar connection and mammalian migrations. J. Afr. Earth Sci. 44, 270–276 (2006)

    ADS  Article  Google Scholar 

  23. 23

    Bassias, Y. Petrological and geochemical investigations of rocks from the Davie Fracture Zone (Mozambique Channel) and some tectonic implications. J. Afr. Earth Sci. 15, 321–339 (1992)

    ADS  CAS  Article  Google Scholar 

  24. 24

    Krause, D. W., Hartman, J. H. & Wells, N. A. in Natural Change and Human Impact in Madagascar (eds Goodman, S. D. & Patterson, B. D.) 3–43 (Smithsonian Inst. Press, 1997)

    Google Scholar 

  25. 25

    Kappeler, P. M. Lemur origins: rafting by groups of hibernators? Folia Primatol. (Basel) 71, 422–425 (2000)

    CAS  Article  Google Scholar 

  26. 26

    Schott, F. A., Xie, S. P. & McCreary, J. P. Indian Ocean circulation and climate variability. Rev. Geophys. 47, RG1002 (2009)

    ADS  Article  Google Scholar 

  27. 27

    de Ruijter, W. P. M., Ridderinkhof, H. & Schouten, M. Variability of the southwest Indian Ocean. Phil. Trans. R. Soc. A 363, 63–76 (2005)

    ADS  Article  Google Scholar 

  28. 28

    Yeager, S. G., Shields, C. A., Large, W. G. & Hack, J. J. The low-resolution CCSM3. J. Clim. 19, 2545–2566 (2006)

    ADS  Article  Google Scholar 

  29. 29

    Otto-Bliesner, B. L. et al. Last glacial maximum and Holocene climate in CCSM3. J. Clim. 19, 2526–2544 (2006)

    ADS  Article  Google Scholar 

  30. 30

    Liu, Z. et al. Global cooling during the Eocene-Oligocene climate transition. Science 323, 1187–1190 (2009)

    ADS  CAS  Article  Google Scholar 

  31. 31

    Huber, M., Sloan, L. C. & Shellito, C. J. in Causes and Consequences of Globally Warm Climates in the Early Palaeogene (eds Wing, S. L., Gingerich, P. D., Schmitz, B. & Thomas, E.) 25–47 (GSA Special Paper 369, Geological Society of America, 2003)

    Google Scholar 

  32. 32

    Huber, M. & Nof, D. The ocean circulation in the southern hemisphere and its climatic impacts in the Eocene. Palaeogeogr. Palaeoclimatol. Palaeoecol. 231, 9–28 (2006)

    Article  Google Scholar 

  33. 33

    Huber, M. et al. Eocene circulation of the Southern Ocean: was Antarctica kept warm by subtropical waters? Paleoceanography 19, PA4026 (2004)

    ADS  Article  Google Scholar 

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Acknowledgements

M. Nowak, W. de Ruijter, I. Tattersall and A. Yoder supplied reprints. J. Aitchison, R. Corlett and A. Switzer are thanked for sharing information. M.H. is supported by US National Science Foundation (NSF) grant 0927946-ATM and uses the US National Center for Atmospheric Research CCSM, which is supported by the NSF. M.H. acknowledges conversations with P. Koch and D. Raup on vicariance biogeography. All computing was performed at the Rosen Center for Advanced Computing, which is part of Information Technology at Purdue, Purdue University.

Author Contributions J.R.A. initiated the study and was primarily responsible for the geologically related aspects. M.H. carried out the palaeo-oceanographic modelling and its interpretation. Both authors contributed to the writing of the paper.

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Correspondence to Matthew Huber.

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Ali, J., Huber, M. Mammalian biodiversity on Madagascar controlled by ocean currents. Nature 463, 653–656 (2010). https://doi.org/10.1038/nature08706

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